Oscillator for magnetos



H. 0. PUTT.

0SCILLATOR FOR MAGNETOS. APPLICATION FEEDING-9,1919.

1,423,734. 2 P d y 25, 1922.

' I 3 I .3 SHEETSSHEET 1.

W A it H. 0. PUTT- 0SC|LLA TOR FOR MAGNETOS.

APPLICATION FILED DEC- 9,1919- I Patentgd Jul y 25, 1922. 3 snans-susn 2.

awn/MM 1760156 0.1 m

H. 0. PUIT.

OSCILLATOR FOR MAGNETOS.

APPLICATION FILED DEC- 9. I919.-

Patented July 25, 1922.

T 0 all whom it may COW/067%. V

TED STATES PATENT oer-ice..-

HARLIE 0. norm, on ELKHAn'r, INDIANA.

osoinna'roe FORMAGNETOS.

Application filed December 9, 1919. Serial No. 343,542.

Be it known that I, HAR IE .O. P'orn a citizen of the United States, residing at Elkhart, in the county of Elkhart and State of Indiana, have invented a new and usefulOscillator tor Magnetos, of which the following is a specification. e

The object-of my invention is to provide a novel oscillator for use in oscillating the magneto armature back and forth a definite degree to generate the ignition spark in low speed motors or farm engines and to utilize in such a device a novel cushion spring construction so arranged that-when the oscillator is at rest, or in normal position there is no stress or tension on the spring, thus addingto theefiiciency off the instrument It is further my object to provide an instrument which may be manufactured very cheaply. It is further my object-to provide a struc ture which is dustproof and which is so constructed that it may be packed with lubricant to reduce wear andpfriction.

It is further my object to providea device that will admit of the employment of a winding springoit half the length oi? that illustrated in the drawings, v and a lighter, more resilient cushion spring inserted in the remaining space so as to secure an increased Winding effort, and to increas'e cushion effect to make the device adaptable to various types of magnetos. It is furtheran object of my invention to provide a device having several parts interchangeable with corresponding parts of the impulselycovered by my Patent 1,326,629 granted December 30, 1919.

Reterringvto the accompanyingdrawings illustrating my invention:

Figure 1 is a vertical section of my oscillator, partly in elevation;

Fig. 2 is. a transverse section onl'ine 22 of Fig. 1; 1

Fig. 3 is a transverse sectional view on line 33 of Fig. 1; i 9

Fig. 4 is a detail view of memberv 6;

Fig. 5 is a. side elevation of same, and

Fig. 61s a transverse sectional-view similar to Fig. 2 but showing a modified. construction employing a winding spring of half thelength shown in Fig. 2 and a lighter, more resilient cushionspring'inserted in the remaining space, to secure an increased Winding effort and increased cushion effect.

Like characters of reference indicate like parts throughout the several views.

Referring to Figs. 1, 2 of the drawings, I provide a winding and cushion spring 1', maintained in a suitable manner in housing 2. The housing 2 is provided with slotted stops 3 integral with or rigidly fixed to the housing, and which serves as a stop for suitable buttons 4, against which the opposite ends of the coil spring fl abut. The housing 2 is preferably formed of sheet metal.

. I provide a novel winding disk 6 which is cast with .a stud 7 and a trigger 6%. Stud 7 is of su'ch size and shape as to admit of its insertion between the slotted stop 3 and but ton 4, whereby the winding disk may be actuated. and its rebound absorbed by the coil spring l which is in operative engagement With the buttons 4. The buttons 4 are freely movable in the housing 2, as indicated in Fig. 2. i

Armature shaft 14 is the standard taper magneto shaft and to it is keyed, by key 11, the winding diskfi. The housing is rigidly fastened to the. magneto frame in any suit able manner. Member l5 designates the outer housing member. Member 17 designates a suitable trip or cam, mounted on camshaft 18, of the engine, and adapted to engage the trigger 6 to produce the oscillation of the winding disk back and forth a definite degree.

2 shows the relative position of the armature of the magneto in relation to they magnet poles, and while the whole structure is neutral or at rest while the camshaft of the engine rotates in the direction indicated by the arrow, the cam. 17 engages trigger 6 and forces it over a definite degree, thus compressing the spring 1 by means of the stud 7- of the winding disk 6, which is rigidly attached to the armature shaft 11 by key 11.

This action slowly moves the armature over into the magnetic field, thus causing the iron core of said armature to becomemagnetically saturated, and, 3 the cam contin ues to rotate until. the trigger 6' slips off from the cam, the spring 1 being compressed at this instant, is suddenly released. and drives the stud 7 together with the armature back to the neutral position, namely the position shown in- Fig. 2. The inertia of the armature'is sufficient to cause the stud 7 to engage the opposite steelzbutton 3 and comand press the spring 1. in the opposite direction suiiiciently to permit the armature core to enter the opposite magnetic field, thus instantly reversing the magnetic polarity of the said armature core and thereby generating an electrical impulse or current wave in the Winding of said armature, which is available for ignition ur'poses in a manner well known to those skllled in the art.

The oscillator is universal: it may be operated in either a right hand or left hand direction Without any changes in its construction.

It will be observed that when the oscillator is at rest or normal position there is no stress or tension on the spring, a condition not obtained in prior types of oscillators; and this improvement adds to the efficiency of the instrument in respect to increased life of wearing parts and increased sensitiveness.

deferring to Fig. (3 of the drawing, a modified form of the invention is disclosed in' which in place of the single coil spring 1, I have substituted two coil spring l and 1 and a rigid stop or web 19 diametrically opposite the slotted stop 3, one of the said springs serving as a winding spring, and the other as a cushion spring. The latter spring is lighter and more resilient and affords an increased cushion efiect, opposed to the incrased winding effect secured from the Spring l. The introduction of these two sarings of different weights or size makes it possible to secure any desired variation of torque or winding power, in connection with the desired cushion effect necessary to adapt the instrument to a Wide range of conditions, which improvement constitutes an important factor in the usefulness of devices of this type.

In some installations of this structure it may be that the cam shaft 18 is necessarily positioned at either side of the magneto or directly abm'e, instead of immediately under the magneto, in Whicl'i case I can position my trigger (5 so as to conform to any requirement. In other words, the trigger (5 may be positioned to normally rest at any degree throughout the arc of its movement, by simply keying it to the shaft of the magneto in any desired position, and then locating the housing to conform.

This dCl} makes installation of the structure including the magneto adaptable to a wide range of conditions respecting the location of the magneto on an engine, for it is frequently impossible to locate the magneto directly over the cam shaft.

il hat I claim is:

1. In a device of the class described. the combination of an annular housing, resilient D'lQELHS mounted in the housing, a disc for an oscillator, said disc having a stud in operative engagement with the spring means,

and a slotted stop through which the aforesaid stud is freely movable.

2. In an oscillator for a magneto, the combination of a magneto armature shaft, a winding disc keyed to said shaft said disc having a trigger, a stud on said Winding disc, an annular housing, said housing having a slotted stop, annularly disposed spring means mounted in the housing and having its resilient action limited by said stop, the aforesaid stud being freely movable through the said slotted stop, for the purposes de scribed.

3. In an oscillator for a magneto, the combination of a magneto armature shaft, a Winding disc keyed to the shaft, said Winch ing disc having a trigger, an annular housing, a slotted stop 011 said housing, a stud on the winding disc said stud being freely movable through the slotted stop, a diametrically opposed stop, coiled springs in the housing having their ends bearing against the aforesaid stops, said springs being of different strength, for the purposes described.

d. In an oscillator for a magneto, the combination of a circular housing adapted to be attached to the drive shaft of an engine, oppositely disposed stops mounted in said housing, one of said stops being slotted, coiled springs annularly arranged in the housing, buttons bearing against the slotted stop and against which the adjacent ends of the springs abut, and oscillator means rigidly attached to the magneto armature shaft and in operative engagement with the aforesaid buttons but freely movable through the slotted stop, whereby the springs may exert an opposed cushioning action when the oscillator means oscillate but normally exert no pressure on the oscillator means.

5. In an oscillator for a magneto, the combination of a circular housing adapted to be attached to the drive shaft of an engine, a coiled winding spring, an opposed cushion spring, said spring being of different strength, a rigid stop against which the respective springs hear at adjacent ends, and a diametrically opposed slotted stop mounted in the housing and against which the other ends of the springs are in operative engagement, an oscillator member having a stud freely movable through the slotted stop. said oscillator member being rigidly attached to the armature shaft and having a trigger member.

6. In a device of the class described, the combination of a circular housing having diametrically opposed stop members, one of said stop members being slotted, coil springs mounted in the housing, buttons adjacent the slotted stop and of larger size than the slot through said stop, the ends of the springs bearing against said buttons, an os cillator member keyed to the armature shaft,

any pressure on the oscillator member, by reason of the normal positioning of the stud in-the slot of the slotted stop and out of 10 Contact With the button, substantially as and for the purposes described.

HARLIE O. PUTT. 

